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Share-based Payments - Summary of Changes in Warrants (Detail) - CAD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract] |  |
Weighted average exercise price, beginning balance | $ 0.24 | $ 0.24
Weighted average exercise price, exercise of warrants | 0.14 | 0.23
Weighted average exercise price, expiry of warrants | 0.08 | 0.70
Weighted average exercise price, ending balance | $ 0.26 | $ 0.24
Number of warrants, beginning balance | 38,654,654 | 45,885,172
Number of warrants, exercise | (13,114,336) | (7,211,308)
Number of warrants, expiry | (82,695) | (19,210)
Number of warrants, ending balance | 25,457,623 | 38,654,654
Amount of warrants, beginning balance | $ 3,364 | $ 3,983
Amount of warrants, Exercise | (1,816) | (619)
Amount of warrants, ending balance | $ 1,548 | $ 3,364

X
- Definition Amount of warrants exercised reserved. + References No definition available. + Details
Name: | cron_AmountOfWarrantsExercisedReserved
Namespace Prefix: | cron_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of warrants outstanding reserved. + References No definition available. + Details
Name: | cron_AmountOfWarrantsOutstandingReserved
Namespace Prefix: | cron_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of warrants exercised. + References No definition available. + Details
Name: | cron_NumberOfWarrantsExercised
Namespace Prefix: | cron_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of warrants expiry. + References No definition available. + Details
Name: | cron_NumberOfWarrantsExpiry
Namespace Prefix: | cron_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants outstanding. + References No definition available. + Details
Name: | cron_NumberOfWarrantsOutstanding
Namespace Prefix: | cron_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average exercise price exercise of warrants. + References No definition available. + Details
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Namespace Prefix: | cron_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average exercise price expiry of warrants. + References No definition available. + Details
Name: | cron_WeightedAverageExercisePriceExpiryOfWarrants
Namespace Prefix: | cron_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average exercise price of warrants. + References No definition available. + Details
Name: | cron_WeightedAverageExercisePriceOfWarrants
Namespace Prefix: | cron_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration